Safety catch device for a gas burner

ABSTRACT

A safety catch device for a gas burner comprises a press part, and a catch part. The press part has a shape of key and is disposed at a front side of a casing of the gas burner. The press part further provides a press chamber with an opening facing backward, and a lateral wall thereof is against a piezo-electric apparatus. Another wall of the press chamber extends a press stem backward. The catch part has a shape of key too and is mounted on the casing opposite to the press part. The catch part provides a push key extending outside the casing and the push key at the front side thereof has a step seat with the top thereof providing a locating hole for receiving an extension spring. The extension spring at the end in the locating hole presses against the inner wall of the casing and the step seat extends laterally a protrusion against the press stem. As soon as the catch part is pressed upward to compress the extension spring, the protrusion is separate from the press stem and the press button is pressed down such that the press chamber and the lateral wall thereof squeezes a control valve in a gas supply device of the gas burner and the piezo-electric apparatus respectively so as to admit the gas through control valve. Hence, the gas can be ignited by way of a spark generated from the piezo-electric apparatus in case of the protrusion being supported by the press stem to keep the catch part from moving downward.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a safety catch device for a gas burner, and particularly to an safety catch device possible to avoid a gas burner being careless used by children.

[0003] 2. Description of Related Art

[0004] Due to a change of times, the burner has become a major device for taking fire. A daily used burner, taking the gas heater as an example, provides advantages such as strong flames, single hand operation, and convenient portability so that the burner is loved and popularly used by us.

[0005] Because the heating torch is quit popularly used and it is often that the heating torch is left around us thoughtlessly. But, it is very possible for children to reach it easily. Due to the imitation and the curiosity frequently behaved during the childhood, a child may easily play the heating torch himself as soon as he gets it. However, it is very easy to catch fire caused by the carelessness during the child playing the heating torch, and the fire resulting from careless play of the child may endanger our lives and the security of our properties greatly. Accordingly, it is too many to list fires caused by the children playing with fire. It is found that the conventional safety switch on the heating torch is easily released in view of being operated with facilitation and it gives children a chance to play it freely. Consequently, it leads to an unexpected accident.

[0006] In order to prevent the tragedy originated from the children playing with fire, the United States and the European countries have enforced the maker of the burner that a safety device has to be equipped with the burner. The U.S. Pat. Nos. 5,460,521 and 5,741,128 owned by the present inventor are typical examples of safety devices suitable for a burner respectively. That is, the burner with a safety device of either U.S. Pat. No. 5,460,521 or U.S. Pat. No. 5,741,128 is in a state of locking before the burner being used and it can be used after the safety device being released from locking. Due to the action of disarm increasing the difficulty of operation, it is not possible for the children to ignite the fire during playing the burner such as the heater torch so that it is possible to reduce the occurrence of disaster.

[0007] Further, the present inventor has filed a U.S. patent application Ser. No. 09/639,849, which is pending, and Taiwanese Patent Application No. 89213608, which is identical with U.S. Patent Application, has been granted gives the present inventor a greater encouragement to develop the present invention.

SUMMARY OF THE INVENTION

[0008] An object of the present invention is to provide a safety catch device for a gas burner, in which an engaging part and a press part are arranged to constitute a doubly reliable switch such that the operation of the burner becomes very much complicate in construction thereof and very much difficult to be operated for preventing an unexpected fatality derived from the careless play conducted by the children.

BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention can be more fully understood by referencing to the following detailed description and accompanying drawings, in which:

[0010]FIG. 1 is an exploded perspective view of a safety catch device for a gas burner according to the present invention;

[0011]FIG. 2 is a sectional view of FIG. 1 after the components thereof being assembled;

[0012]FIGS. 3 and 4 are section views similar to FIG. 2 illustrating steps with regard to release the safety catch device for a gas burner of the present invention from the state of locking;

[0013]FIG. 5 is a top sectional view illustrating a press part, a press button, and a catch part in the safety catch device for a gas burner of the present invention being in a state of locking; and

[0014]FIG. 6 is a sectional view illustrating a step of automatic locking operated by the safety catch device for a gas burner according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Referring to FIGS. 1 and 2, a safety catch device for a gas burner according to the present invention basically comprises a press part 1, an engaging part 2, a catch part 3 and a press button 4. The safety catch device is disposed above a storage barrel 5 next to a gas supply device 6, and it is covered with a casing 7.

[0016] Wherein, the press part 1 provides a shape of key and has a press chamber 11 at the front side thereof with an opening facing the back thereof. The press chamber 11 receives an extensible control valve 64 and a press tenon 12 at a lateral wall of the press chamber 11 is disposed against a piezo-electric apparatus 8. A press stem 13 extends rearward from another lateral wall of the press part 1 and an outer end of the press stem 13 is in a state of resisting the lock part 3 before operation so that the press part 1 is not possible to be push backward. Besides, the press stem 13 has a lateral engaging projection 14 to engage with the press button 4 so that the press button can be in a state of position lock. Moreover, a fixing base 15 at the bottom of the press part 1 provides a slide rail 151 at both lateral sides thereof respectively and forms a rail groove 152 with a rail tenon 153 vertically extending from the rail groove 152 such that the engaging part 2 can displace along with the press part 1. In order to move smoothly in the casing 7, the press part 1 at both lateral walls thereof may protrude a plurality of slide projections 16 respectively to lap over a rib plate 74 on the inner wall of the casing 7.

[0017] The engaging part 2 is a lid with an opening top and two opposite walls of the opening top provide two lateral projections 21 respectively corresponding to the rail groove 152 for engaging with the rail groove 152 so that the respective rail projection 153 can be disposed between the two lateral projections 21. A spring 22 is mounted between the front inner wall of the engaging part 2 and the fixing base 15 such that the fixing part 2 can move back and forth on the fixing base 15 and can be restored to the original position thereof. Besides, the engaging part 2 extends backward a tilt lock plate 23 with respect to a lateral wall of the press stem 13 and an end of the engaging part 2 projects inward a lock hook 24 with a hook recess 241 to move relative to a plate tenon 37 on the catch part 3. In case of the hook plate 23 being in a state of lap joining with the plate tenon 37, the catch part 3 is resisted from pushing upward before operation and in case of the hook plate moving backward and being in a state of separating from the plate tenon 37, the catch part 3 is admitted to push upward.

[0018] The catch part 3 also provides a shape of key and is disposed in the casing 7 behind the press stem 13 and the lock plate 23. A push key 31 of the catch part 3 extends outward the casing 7 and a step seat 32 at the front side of the catch part 3 has a locating hole 33 with a extension spring 34 inside. The extension spring 34 at an end thereof urges against a stopper 75 of the casing 7. Further, a protrusion 35 extends laterally from the step seat 32 and the plate tenon 37 is provided on a bottom plate 36 of the step seat 32 corresponding to the protrusion 35 to be pressed by the press stem 13 so that the press stem 13 is not possible to be pressed backward and the lock hook 24 pressingly catches the plate tenon 37 such that the plate tenon is not possible to move upward.

[0019] The press button 4 extends inward two hook plates 41 and a spring 42 is attached to and surrounds the hook plates 41 before the press button 4 is inserted into a fitting hole 73, which is provided in the casing in advance, without loosening out. Besides, in order to enhance the smoothness during pressing and the reliability during assembling, the two hook plates 41 at the inner ends thereof project a guide tenin 43 respectively so as to be inserted into a guide groove 731 at a lateral side of the fitting hole 73. When the press part 1 is pressed backward, the two hook plates 41 at the end parts thereof are disposed against the stem tenon 14 to keep the press part 1 in a state of being located in place and supplying burning gas.

[0020] The storage barrel 5 is hollow and provides a threaded hole at the top thereof to engage with a hollow screw rod 61 on the gas supply device 6 at the bottom thereof such that the burning gas can flow toward a conventional flow control valve 63 via a gas passage 62 as the art disclosed in the U.S. Pat. No. 5,916,319 does. The burning gas can be regulated in a state of cutoff/admiftance and the output amount thereof. The gas passing through the flow control valve 63 is blocked by an extensible control valve 64 received in the air passage 62 and the gas is not possible to be supplied to a gas jet part 65. As soon as the press part 1 is pressed down, the extensible control valve 64 and the pieoz-electric apparatus 8 are pushed simultaneously to open the flow control valve 64 such that the gas can enter the gas passage 62 through the flow control valve 64. Finally, the gas can spray out from a conventional nozzle at the gas jet part 65 to mix with the air through an air hole. Then, the gas-air mixture is guided to the mouth of a flame projector (not shown) to be ignited by the spark of static electricity generated from the piezo-electric apparatus 8 such that the operation of combustion can be performed successfully. It is noted that the gas jet part 65 and the flame projector are conventional art and no detail will be described further.

[0021] Moreover, in order to avoid the gas supply device 6 and the storage barrel 5 being detached by the user himself, a disk 66 above the screw rod 61 of the gas supply device 6 can provide a plurality of disk teeth 661 surrounding the periphery thereof to mesh with an inner gear ring part 521 of a locating plate 52. Then, the screw rod 61 engages with the threaded hole 51 afterward. When the locating plate 52 touches the top of the storage barrel 5 or is received in a barrel groove 53 with a shape identical with the locating plate 52 and fastened to the storage barrel 5 by way of screws. Hence, the disk teeth 661 are caught by the inner gear ring part 521 and the disk 5 is unable to turned any more.

[0022] Next, the storage barrel 5 is a plastic barrel made from injection molding and the lower part thereof is attached with a bottom cover 54 by way of being welded together with the supersonic wave. In order to prevent the bottom cover 54 from being detached from the storage barrel 5 caused by the high pressure of liquefied gas, at least two pin holes 55, which are provided on the lower rim of the barrel, align with cover grooves 56, which are provided on the bottom cover corresponding to the pin holes 55, and are passed through a locating pin 57 respectively before the treatment of the welding of supersonic wave.

[0023] The casing 7 is composed of a left casing part 71 and a right casing part 72, which joins to the left casing part 71 as a whole piece, and the preceding component parts are enclosed therein above the storage barrel 5. The respective inner wall surface of the left and the right casings 71, 72 has conventional tenons, ribs, grooves, and holes for the two casing parts being possible to be joined together and the gas supply device 6 being possible to be received in and fixedly attached to the casing 7. Besides, one of the casing parts 71, 72, such as the left casing part 71, can provide a button hole 73 for receiving and locating the press button 4. In addition, a plurality of rib plates 74 are attached to the casing 7 so that the press part 1 and the engaging part 2 are possible to slide and guided to the catch part 3. Furthermore, the stopper 75 above the catch part 3 is used for receiving and pressing the extension spring 34 of the catch part 3 such that each part in the casing 7 can be actuated more smoothly.

[0024] Referring to FIGS. 2 to 5, while the safety catch device for a gas burner according to the present invention is in use, the flow control valve 63 is opened first, and then the engaging part 2 is pressed down to move backward along the fixing seat 15 such that the lock hook 24 is separated from the plate tenon 37 to disarm the catch part 3 from the state of locking due to the lock hook 24 losing the function of pressingly catch. Meanwhile, the catch part 3 is pushed upward to urge the extension spring 34 such that the plate tenon 37 engages with the hook recess 241 to locate the catch part 3 and the upward movement is stopped. At this moment, the press stem 13 behind the press part 1 can be pressed and move to a position under the protrusion 35 to form a lap join over the protrusion 35 due to the protrusion 35 moving upward such that the catch part 3 can stay in place without moving downward. In the mean time, the extendible control valve 64 and the piezo-electric apparatus 8 are compressed simultaneously to admit the gas reaching to the flame projector through the extendible control valve 64 and the gas jet part 65 respectively. The gas sprayed out of the mouth on the flame projector can be ignited immediately by the spark generated from the piezo-electric apparatus 8 to carry out the operation of combustion. Thus, the flame can burn continuously as soon as the finger keeps to press the press part 1 to allow the extendible control valve in a state of opening.

[0025] In case of the combustion being carried out a long period of time, the press button 4 can be pressed down and the press part 1 is released to actuate the two hook plates 41 against the engaging projection 14 such that the press button 4 can be located in place to stop the press part 1 bouncing outward.

[0026] Referring to FIG. 6, when the burner is not in use, the press part 1 is pressed again to retreat the engaging projection 14 and the engaging part 2 slightly such that the plate tenon 37 and the lock hook 24 are in a state of lap joining together. The press button 4 can be restored to the original position thereof by way of the stretch of the spring 42 due to missing the lateral push force of the engaging projection 14. The press part 1 moves forward due to the rebound action of the piezo-electric apparatus so that the spring 22 between the fixing seat 15 and the engaging part 2 is urged and the protrusion 35 results in being not supported by the press stem 13 and the engaging part 2 is dragged out simultaneously. The catch part 3 moves downward to the original position thereof due to the stretch action of the extension spring 34 to separate the lock hook 24 from the plate tenon 37 and to be restored to the original position thereof by way of the stretch of the spring 22 as shown in FIG. 2 again.

[0027] It is appreciated that the engaging part and the press part of the present invention constitutes a doubly reliable switch to make the operation of the burner very much complicate and difficult so that it is capable of preventing an unexpected fatality derived from the careless play conducted by the children and fulfilling the safety regulations of U.S. and European countries. Furthermore, once the operation of combustion of the present invention is to be released, the only thing has to be done is simply to press down the press part and each locking element thereof can be restored to the original position to cut off the gas supply. In this way, the flame can be extinguished and the safety catch device can be in a state of locking so that the present invention provides a design full of humanization. Moreover, the parts of the present invention have been modularized so that it is very easy for the safety catch device of the present invention to be set up conveniently.

[0028] While the invention has been described with reference to a preferred embodiment thereof, it is to be understood that modifications or variations may be easily made without departing from the spirit of this invention, which is defined by the appended claims. 

What is claimed is:
 1. A safety catch device for a gas burner, comprising: a press part, having a shape of key, being disposed in front of a casing of the gas burner, providing a press chamber with an opening facing a back of the casing, a lateral wall thereof being against an piezo-electric apparatus, and another wall thereof extending backward a press stem; a catch part, having A shape of key too, being mounted on the casing opposite to the press part, providing a push key outside the casing and the push key at a front side thereof having a step seat, the step seat at a top thereof providing a locating hole for receiving an extension spring, an end of the extension spring pressing against an inner wall of the casing, and the step seat extending laterally a protrusion against the press stem; whereby, as soon as the catch part is pressed upward to compress the extension spring, the protrusion is separate from the press stem; the press button is pressed down such that the press chamber and the lateral wall squeeze a control valve in a gas supply device of the gas burner and the piezo-electric apparatus respectively to admit the gas through control valve; and the gas is ignited by a spark generated from the piezo-electric apparatus and the protrusion is supported by the press stem to keep the catch part from moving downward.
 2. The safety catch device for a gas burner according to claim 1, wherein the press part at a bottom thereof provides a fixing base and an engaging part with an open top is disposed at a bottom of the press part to engage with the fixing base; a spring is mounted between the fixing base and engaging part so that the engaging part can slide relative to the fixing base and restore to an original position thereof; the engaging part extends a tilt lock plate and an end of the lock plate laterally projects a lock hook with a hook groove; the step seat of the catch part at a front lower part thereof provides a vertical bottom plate with a plate tenon thereon projecting laterally, the plate tenon at an upper portion thereof is caught by the lock hook to restrain the catch part from being pushed upward; whereby, as soon as the engaging part is pressed to separate the lock hook from the plate tenon so as to push the catch part upward, the projection is separate from the press stem and the hook groove engages with the plate tenon to locate the catch part so that the press part can be pressed down and the press stem thereof supports the projection to resist the catch part from moving; when the press part is pressed down again, the engaging part retreats slightly so that the plate tenon and the lock hook form a lap connection and the catch part can restore to an original poison thereof.
 3. The safety catch device for a gas burner according to claim 2, wherein the fixing base at both lateral sides thereof provides a slide rail respectively to constitute a rail groove between the fixing base and the press part and a rail projection extends vertically from the respective rail groove; the engaging part at two opposite lateral walls thereof provides two lateral projections to insert into the respective rail groove such that the rail projection can be received the two lateral projections respectively.
 4. The safety catch device for a gas burner according to claim 1, further comprises a press button, being received in a button hole provided in the casing and disposed at an orientation same as the press stem, the press button horizontally extends two hook plates attached with a spring circumferentially to pass through the button hole and to be located, and the press stem on the press part at a lateral side thereof protrudes an engaging projection; whereby, once the press part is in a state of being pressed to push the press button laterally, the two hook plates can contact with the engaging projection to keep the press button from loosening out and the press part can keep in a state of being in place so that the gas can supply continuously; while the press part is pressed down to separate the engaging projection from the two hook plates, the press button can be restored to an original position thereof and the press part also can be restored to an original position thereof due to a rebound of the piezo-electric apparatus.
 5. The safety catch device for a gas burner according to claim 4, wherein the two hook plates at a respective end thereof has a guide projection to be movably received in a guide groove provided in the button hole.
 6. The safety catch device for a gas burner according to claim 1, wherein an engaging tenon extends laterally from the press part to touch a contact surface on the piezo-electric so as to increase a contact area thereof.
 7. The safety catch device for a gas burner according to claim 1, wherein a screw rod disposed at a bottom of the gas supply device is fastened to a threaded hole at a top of the storage barrel so that the gas in the barrel can be sent pass through a gas passage in the gas supply by way of a gas output control of an control valve and a cutoff/admittance control of another control valve received in the press part.
 8. The safety catch device for a gas burner according to claim 7, wherein the screw rod of the gas supply device provides a disk with a plurality of teeth surrounding a periphery thereof to mesh with a locating plate with a plurality of inner ring teeth such that the screw rod can engage with the threaded hole and the locating plate can fixedly attached to the storage barrel at the top thereof.
 9. The safety catch device for a gas burner according to claim 1, wherein the casing provides a left and a right casing parts joining to each other and the gas supply device is disposed therein and a plurality of rib plates protruding from an inner wall of the casing available for the press part and the engaging part sliding thereon to guide the press stem and the lock plate to the catch part.
 10. The safety catch device for a gas burner according to claim 7, wherein the storage barrel at a lower rim thereof provides at least two pin holes and a bottom cover provided thereon provides a cover groove corresponding to the pin holes such that a locating pin can be inserted into the pin holes and the cover groove respectively before the bottom cover being welded to the storage barrel by way of supersonic wave to increase the structural strength of a joint between the bottom cover and the storage barrel. 